Just in case we have some european readers, ultimate load factor for them is two times limit load factor for their certifications.

To clear this up since I have had a bunch of questions arise from speaking of limit load and ultimate load factor:

Limit load factor = the published g limitations in your POH and the point where structural damage can occur.

Ultimate load factor = as Ryan said, in the USA 1.5 times limit load or two times it in Europe. This is the point where structural damage is certain and items may begin to come off the aircraft. Ryan: Is it may come off or will come off at ULF? I can't recall for certain.